package com.example.geterror;


import java.io.File;  
import java.io.FileOutputStream;  
import java.io.PrintWriter;  
import java.io.StringWriter;  
import java.io.Writer;  
import java.lang.Thread.UncaughtExceptionHandler;  
import java.lang.reflect.Field;  
import java.text.DateFormat;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Map;  


  

import android.content.Context;
import android.content.pm.PackageInfo;  
import android.content.pm.PackageManager;  
import android.content.pm.PackageManager.NameNotFoundException;  
import android.os.Build;  
import android.os.Environment;  
import android.os.Looper;  
import android.util.Log;  
import android.widget.Toast;  
  

/**
 * 
* @ClassName: CrashHandler 
* @Description: 系统默认的UncaughtException处理类的实现类 用于当程序异常的时候 由该类接管程序并且发送错误信息
* @author haiabi@163.com
* @date 2015-12-19 下午9:52:13 
*
 */
public class CrashHandler implements UncaughtExceptionHandler {  
      
    public static final String TAG = "CrashHandler";  
      
    //系统默认的UncaughtException处理异常 
    private Thread.UncaughtExceptionHandler mDefaultHandler;  
    //CrashHandler实例  
    private static CrashHandler INSTANCE = new CrashHandler();  
    //程序的Context对象  
    private Context mContext;  
    //用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();  
  
    //用于格式化日期作为日志文件名的 时间
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");  
  
    /** 保证只有�?��CrashHandler实例 */  
    private CrashHandler() {  
    }  
  
    /** 获取CrashHandler实例 ,单例模式 */  
    public static CrashHandler getInstance() {  
        return INSTANCE;  
    }  
  
     /**
      * 
     * @Title: init 
     * @Description: 初始化方法
     * @param @param context    设定文件 
     * @return void    返回类型 
     * @throws
      */
    public void init(Context context) {  
        mContext = context;  
        //获取系统默认的UncaughtException处理 
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();  
        //设置该CrashHandler为程序的默认处理异常
        Thread.setDefaultUncaughtExceptionHandler(this);  
    }  
  
    /** 
     * 当UncaughtException发生时会转入该函数来处理 
     */  
    @Override  
    public void uncaughtException(Thread thread, Throwable ex) {  
        if (!handleException(ex) && mDefaultHandler != null) {  
            //如果用户没有处理则让系统默认的异常处理器来处处理 
            //mDefaultHandler.uncaughtException(thread, ex);  
        } else {  
            try {  
                Thread.sleep(3000);  
            } catch (InterruptedException e) {  
                Log.e(TAG, "error : ", e);  
            }  
        }  
    }  
    /**
     * 
    * @Title: handleException 
    * @Description:自定义错误处 理，搜集错误信息发送和错误报告等操作都是在这里完成
    * @param @param ex
    * @param @return    设定文件 
    * @return boolean    返回类型 
    * @throws
     */
    private boolean handleException(Throwable ex) {  
        if (ex == null) {  
            return false;  
        }  
        //使用Toast来显示异常信�? 
        new Thread() {  
            @Override  
            public void run() {  
                Looper.prepare();  
                Toast.makeText(mContext, "很抱歉，程序发生异常。即将退出", Toast.LENGTH_LONG).show();  
                Looper.loop();  
            }  
        }.start();  
        //收集设备参数信息   
        collectDeviceInfo(mContext);  
        
        StringBuffer sb = new StringBuffer();  
        for (Map.Entry<String, String> entry : infos.entrySet()) {  
            String key = entry.getKey();  
            String value = entry.getValue();  
            sb.append(key + "=" + value + "\n");  
        }  
        
        //保存日志文件  
        String logFilePath=saveCrashInfo2File(ex);
        String subject="应用程序"+" "+"APP"+" "+"发生了一个崩溃";
          
        EmailRunnable emailRunnable=new EmailRunnable(mContext,ex);
	    emailRunnable.setSubject(subject);
	    emailRunnable.setBody(sb.toString());
	    emailRunnable.setAttachment(logFilePath);
		new Thread(emailRunnable).start();;
        return true;  
    }  
    /**
     * 
    * @Title: collectDeviceInfo 
    * @Description: 收集设备参数信息 
    * @param @param ctx    设定文件 
    * @return void    返回类型 
    * @throws
     */
    public void collectDeviceInfo(Context ctx) {  
        try {  
            PackageManager pm = ctx.getPackageManager();  
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);  
            if (pi != null) {  
                String versionName = pi.versionName == null ? "null" : pi.versionName;  
                String versionCode = pi.versionCode + "";  
                infos.put("versionName", versionName);  
                infos.put("versionCode", versionCode);  
            }  
        } catch (NameNotFoundException e) {  
            Log.e(TAG, "an error occured when collect package info", e);  
        }  
        Field[] fields = Build.class.getDeclaredFields();  
        for (Field field : fields) {  
            try {  
                field.setAccessible(true);  
                infos.put(field.getName(), field.get(null).toString());  
                Log.d(TAG, field.getName() + " : " + field.get(null));  
            } catch (Exception e) {  
                Log.e(TAG, "an error occured when collect crash info", e);  
            }  
        }  
    }  
    /**
     * 
    * @Title: saveCrashInfo2File 
    * @Description: 保存错误信息到文件中 
    * @param @param ex
    * @param @return     返回文件名称,便于将文件传送到服务器
    * @return String    返回类型 
    * @throws
     */
    private String saveCrashInfo2File(Throwable ex) {  
          
        StringBuffer sb = new StringBuffer();  
        for (Map.Entry<String, String> entry : infos.entrySet()) {  
            String key = entry.getKey();  
            String value = entry.getValue();  
            sb.append(key + "=" + value + "\n");  
        }  
          
        Writer writer = new StringWriter();  
        PrintWriter printWriter = new PrintWriter(writer);  
        ex.printStackTrace(printWriter);  
        Throwable cause = ex.getCause();  
        while (cause != null) {  
            cause.printStackTrace(printWriter);  
            cause = cause.getCause();  
        }  
        printWriter.close();  
        String result = writer.toString();  
        sb.append(result);  
        try {  
            long timestamp = System.currentTimeMillis();  
            String time = formatter.format(new Date());  
            String fileName = "crash-" + time + "-" + timestamp + ".txt";  
            String path = "/sdcard/crash/";  
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {  
                
                File dir = new File(path);  
                if (!dir.exists()) {  
                    dir.mkdirs();  
                }  
                FileOutputStream fos = new FileOutputStream(path + fileName);  
                fos.write(sb.toString().getBytes());  
                fos.close();  
            }  
            return path+fileName;  
        } catch (Exception e) {  
            Log.e(TAG, "an error occured while writing file...", e);  
        }  
        return null;  
    }  
}  